respect windows

lib/msf/util.rb

@@ -21,3 +21,4 @@ end
 
 # Executable generation and encoding
 require 'msf/util/exe'
+require 'msf/util/helper'

lib/msf/util/helper.rb

@@ -0,0 +1,19 @@
+# -*- coding: binary -*-
+
+module Msf
+module Util
+class Helper
+  # Cross-platform way of finding an executable in the $PATH.
+  #
+  #   which('ruby') #=> /usr/bin/ruby
+  def self.which(cmd)
+    exts = ENV['PATHEXT'] ? ENV['PATHEXT'].split(';') : ['']
+    ENV['PATH'].split(File::PATH_SEPARATOR).each do |path|
+      exts.each { |ext|
+        exe = File.join(path, "#{cmd}#{ext}")
+        return exe if File.executable?(exe) && !File.directory?(exe)
+      }
+    end
+    return nil
+  end
+end

metasploit-framework.gemspec

@@ -25,8 +25,7 @@ Gem::Specification.new do |spec|
   spec.license       = 'BSD-3-clause'
 
   # only do a git ls-files if the .git folder exists and we have a git binary in PATH
-  if File.directory?(File.join(File.dirname(__FILE__), ".git")) &&
-      ENV['PATH'].split(':').collect {|d| Dir.entries d if Dir.exists? d}.flatten.include?("git")
+  if File.directory?(File.join(File.dirname(__FILE__), ".git")) && Msf::Util::Helper.which("git")
     spec.files         = `git ls-files`.split($/).reject { |file|
       file =~ /^documentation|^external/
     }